The M21-750-461, 110933 0.75 inch x 21 ft BMP21 Clear B-461 Label with Printable Zone. Self-Laminating Polyester (B-461) is a clear film with a matte white printable zone ideal for cables, laboratory ID or general labeling where graphics need to be protected. Self-Laminating Polyester has a permanent acrylic adhesive and is thermal transfer printable. Good print smudge resistance, solvent resistance and high/low temperature performance. All-in-one cartridge includes ribbon and label supply.